By A. A. Collyer
Is helping the person with out formal education in plastic fabrics during the maze of fabrics choice to his ultimate aim. people with a easy wisdom of this region will enjoy the more effective points of the advisor
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Extra resources for A Practical Guide to the Selection of High-Temperature Engineering Thermoplastics
The requirement is for 10 discs per annum. 1. Material cost Volume of the part = Ylt^t where r is the radius and t the thickness of the part. 24 x 1 0 3 = 0 . 3, namely Cp = 1 . 1 x 0 . 0 1 5 x 3 . 231p Cost per 1 0 0 0 = £ 5 2 . 75 = £6000 During the year 10 products are made. Therefore the cost per product Cp = fiQiKi IO 5 products = 5 6 ton A 6 0 t o n m a c h i n e s h o u l d therefore be adequate, but it would leave little margin. 2 find the shot size of a machine of clamp force 6 0 ton. The answer is about 80g.
Such calculations require a considerable data bank of Theological and thermal behaviour, and it is possible for the operator to add to this data bank if a specialized grade is being used. Once the optimum moulding conditions and 48 Costing ofplastics products INTRODUCTION & CAVITY SELECTION ! 5: A flow chart illustrating the 'SIMPOL' program (by courtesy of Ian Barrie) cycle time have been obtained the program calculates the machine specification to handle the process. 3, and a final summary is given.
In an interesting study by Birley and Scott [ 101, a whole range of processes for making a specific part were costed. 2. The product was a casing for a cable avoidance tool made from low density polyethylene; it was expected that 1000 casings would be made a year. The mouldings could be either blow moulded or rotationally moulded in one operation, or formed in two parts and assembled later, the parts being injection moulded, vacuum formed or manufactured using hand lay-up or spray techniques. The costing was based on the a s s u m p t i o n that the cheaper rotational moulding equipment was used .